62% (1978)

68% (1976)

57% (1983)

64% (1982)

58% (1978)

59% (1976)

62% (1979)

66% (1978)

54% (1977)

60% (1984)

47% (1976)

58% (1979)

62% (1978)

59% (1983)

80% (1986)

0% (1984)

0% (1976)

0% (1988)

80% (1986)

90% (1977)